Process of making split pulleys



Patented Mar. Z7, 1928.

. UNITED strains WILLIAM D. IIAMERSTADT, or INDIANAPOLIS, INDIANMAssIGNoIwro noenwoon .MANUFACTURING lcotisant, or INDIANAIoLIs, INDIANA, A coaieonArIoN.Y

Paocnss lor MAKING srLIT rULLnYs.

jApplication filed November24,v1925. p Serial No.. 711,181.

rlhis inventionfirelates Ito a split fibrous pulley structure and the process Iof making the same. The `object of the invention'is to provide a split fibrous pulley which may be 'detachably secured about a shaft inthe usual manner, the pulley :of this character being usually formed from paper ylafniinatifons compressed together so that the fibre paper body will be of great density and be of a'substantially solid character 'for providinga surface having a high coefficient of friction;

The principal feature of the invention resides Vin the manner of providing anchoring lugs in each of fthegsl'ylit' sections, the corresponding lugsV .in each section 4being Ydetachably connected by 'a suitable-screw bolt extending therein.

Another feature of the invention, @and probably the most important, resides "in the manner of forming fthe lugs `in 'recesses previously formed lin the laminate'd'sections of the pulley by Vdie-casting metal therein under such Apressure as to felfect 'a bonding with the fibrous surface., or `conform vto such irregularities of surface as may be created either jby thelaminations/or the formation 'of the metal receiving `Arecess. V'The lugs or anchors are cast about the screwb'oltprconnect'in'g rodwhich is vpreviously A'inserted in place, so that the internal screw threads of the lugs or anchors are formed therein during the casting process.

The full nature of the invention will be understood from the accompanying drawings Vand the following description and claims.

Fig. l is a perspective View of the split pulley. Fig. 2 is a section taken on the line 2 2 of Fig. 1. Fig. 3 is a frontelevation showing one-half of the pulley cut away in sections. Fig. 4 is a modified form showing f a central vertical section illustrating the use of bars extending completely through the pulley structure instead of lugs as shown in Fig. 2.

In the drawings there is shown a pulley structure l0 formed of a plurality of paper or fibrous discs associated together and compressed under high pressure in the usual manner of making paper pulleys or the like. The paper laminations forming the pulley 10 as shown in Fig. 1, are cut diametrically and provided with suitable recesses in each r end for receiving the metal forming the lugs ,5 as illustrated in Fig. 2. The bores 11 are then' drilled 'through the upper surface at right angles to the split l2 and substantially equi-distant from the ends as wellas from the central vertical line extending 'at right anglesto the split surface 12. f rlhe screw threaded locking Vbolts 13 are mountedinplace so as to` extend through the reducedportion ofthe bores 11 from Vone of the split vsections to the otherlf The pulley structure is then pla-ced 'in "a cylindrical sleeve 14 having its end extendingfbeyond the 'end of the pulley, saidl outwardly extend` ing yendsof said sleeve being engaged over the die-'casting blocks k15 which lmay "beA moved iinto place sol as to engage thev opposite ends offthe pulley structure. The die-cast# ingblocks 15 arethereup'on'forced toward l each other so as to compress the paper la-nnnatlons and hold them 1n position under high pressure such as tomaterially increase l their density as illustrated in Fig. 2.

A suitable die-casting metal is then forced i through the branchpassa'ge-ways 16 in Vthe die-casting blocks yso as to force vthe/metal into the 'lug'forming recesses to'form the lugs 17. lnasmuch as theconnecting Ibolts 1'3 extend 'diametrically through `said passages, andthe lowerv endsthere'of are .screw threaded, the n lmetal forming thev lug 17 will form about said bolts, and the threads thereof will cast complementary threads in the metal of the lugs. This eliminates the necessity of boring or tapping the lugs, the bolts 13 being capable of being readily unscrewed therefrom after the structure is completed. If necessary, set screws 18 may be employed to screw through the sleeve 14gV and bear against the heads of the bolts 13 for holding them firmly in position to prevent any leakage of the metal through the bores 11.

The metal forced into the lug forming recesses will engage the fibrous surface thereof so as to penetrate into the bores and form a bond therewith, or said metal will conform to any irregularities of the surface. Such irregularities ma f occur. from the drilling of the recesses, or rom soft spots in the fibre being compressed by the metal, or by reason of slight separations between the laminations of the paper discs, as set forth and described in Patent No. 1,535,134. Thus the lug 17 for forming in connection with the lugs, the heads 19, depending upon thevshape of the die head o. y

For securing the laminations together and holding them in 4their compressed position, a plurality of rods or dowel pins may be employed by inserting them through the laminations before the die casting process, as has heretofore been the practice, or the body of the structure may be provided with a plurality of holes extending Vlongitudinally thereof near the peripheral surface for receiving the die-cast metal forced therein under high pressure through the die blocks 15 at the same time that the lugs 17 are cast thereby. Thus the same bonding effect may be had with respect to the securing of the laminations together' as above described with respect to the lug 17 as set forth in the above mentioned Letters Patent.

As shown in the modified form illustrated in Fig. 4, a plurality of bars 21 may be diecast in the structure in the same manner as above set forth with respect to the lug 17, said bars extending completely'through the y laminations from one end of the `pulley structure to the other, the same being con# nected by the bolts 13 cast therein. .The bars 21 may or may not serve as the 'binding element, as may be desired, and an end plate or head 22 may be cast integral therewith andformed at each end of the structure.

The invention claimed is: y v 1.7The process of forming a split pulley, comprising two sections consisting in providing abore in each of said sections extending longitudinally thereof, mounting tie members transversely of said boresso as to extend therein and from one `of said sections to the other, and casting metal into said bores as a mold, whereby the metal vduring the casting operation will engage ,the tie members `and secure theinin place for connecting the pulley sections together.

2. The process of forming a split pulley comprising two sections consisting in providing a pair of bores in each of said sections adjacent their split surfaces, mounting tie bolts transversely of said bores so as to extend from one section to the other, and casting metal into said bores as a mold for forming the anchor members for said tie bolts, whereby the metal during the casting operation will surround and detachably secure the tie members in place so as to, permit of the removal or insertion thereof for detachably connectingy the pulley sections together.

3. The process of forming a. split pulley comprising two sections formed of a plurality of fibrous laminations, consisting in` providing each of said sections with a plurality of bores adjacent their abutting split surfaces and extending longitudinally thereof, mounting screw threaded tie bolts therein so as to extend transversely of said bores from one section to the other, and die casting metal into said bores as a mold under sufficientY` pressure to engage in any irregularities formed in the surface of said .bores for securing the laminations together, the screw threads of said bolts being cast therein so as torpermit the removal thereof `and the disengagement of said sections, substantially as and for the purpose described. e

In witness whereof, I have hereunto aflixed my signature.

' WILLIAM D. HAMERSTADT. 

